"This is a televised version of the stage production," Underwood says in a behind-the-scenes video that was released this week. Adds Benanti: "We're not trying to remake the movie. Nobody can remake the movie."

Hear Underwood and Moyer sing in a sneak peek at rehearsal footage in the teaser video below.

NBC's The Sound of Music will air on Thursday, Dec. 5 at 8/7c. Will you watch?